Article
Chemistry, Physical
Roman Avetisov, Ksenya Kazmina, Artem Barkanov, Marina Zykova, Andrew Khomyakov, Alexander Pytchenko, Igor Avetissov
Summary: A simple method has been developed to synthesize high pure tris(8-hydroxyquinoline)aluminum (Alq(3)) from commercial available materials. The synthesis involves a one-step exchange chemical reaction under controlled temperature, with water removal by phosphorus anhydride.
Article
Biochemistry & Molecular Biology
Elisa Lassi, Benedetta Maria Squeo, Roberto Sorrentino, Guido Scavia, Simona Mrakic-Sposta, Maristella Gussoni, Barbara Vercelli, Francesco Galeotti, Mariacecilia Pasini, Silvia Luzzati
Summary: Conjugated polymers with alkyl-potassium-sulfonate side chains have been investigated as anode interlayers in inverted geometry P3HT:PC61BM devices. The results show that the conjugated backbone of CPEs needs to be tailored for effective anode modification and a good energy-level match with the photoactive layer. Additionally, the sulfonate moieties in CPEs play a role in solubility, self-doping, and hole selectivity of the top electrode.
Article
Engineering, Electrical & Electronic
Ahmad A. Ahmad, Ihsan A. Aljarrah, Qais M. Al-Bataineh, Riad Ababneh, Ahmad Telfah
Summary: Bis(8-hydroxyquinoline) zinc (ZnQ(2)) and tris-(8-hydroxyquinoline) aluminum (AlQ(3)) organometallics have been synthesized and incorporated into poly(methyl methacrylate) (PMMA) films for potential use in green-emitting OLED applications. Various analyses confirm the formation of the compounds, and measurements of conductivity and photoluminescence suggest their suitability for green-emitting OLEDs.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Fulin Sun, Chunjun Liang, Huimin Zhang, Chao Ji, Qi Song, Hongkang Gong, Dan Li, Fangtian You, Zhiqun He
Summary: Ion migration plays a crucial role in the stability of perovskite solar cells. The insertion of interfacial layers between the electron-transporting layer and cathode has been shown to enhance device performance, with the use of 8-hydroxyquinoline metal complexes as cathode interfacial layers (CILs) leading to improved energy match, reduced contact resistance, accelerated charge transfer, and suppressed non-radiative recombination. The introduction of CILs also protects the device from moisture and blocks ion diffusions, ultimately improving device stability.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Abdu Saeed, Mir Ali Razvi, Aysh Y. Madkhli, Shittu Abdullahi, Fadwa Aljoud, Torki A. Zughaibi, Samia F. Aboushoushah, Ahmed Alshahrie, Adnan Memic, Faten E. Al-Hazmi, Numan Salah
Summary: Tris(8-hydroxyquinoline) aluminum (Alq3) has been used as a fluorescent optical material for in vitro bioimaging for the first time. The optimal concentration of Alq3 was found to be 25 μM based on cell viability and photoluminescence spectroscopy results. This study suggests the potential use of Alq3 as a fluorescent optical material in bio-applications.
Article
Materials Science, Coatings & Films
Jianwei Hou, Haizhou Zhao, Zhiming Zhang, Liangmin Yu, Xuefeng Yan
Summary: Functional antifouling coatings are developing as a direction for marine antifouling coatings. In this study, tris-(8-hydroxyquinoline) aluminum modified with titanium dioxide (AlQ3:TiO2) coatings were prepared, which exhibited photocatalytic antibacterial and fluorescent algae inhibition under visible irradiation. The AlQ3:TiO2 coatings showed high antibacterial activity against E. coli with an inhibition efficiency of up to 97.51%. Additionally, the reactive oxygen species (ROS) and weak fluorescence generated under visible irradiation effectively inhibited the growth and settlement of algae. Based on comprehensive antifouling experiments and electrochemical characterization, a possible antifouling mechanism for AlQ3:TiO2 coatings is proposed.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Lijia Chen, Cunyun Xu, Wei Hu, Yanqing Yao, Lianbin Niu, Gaobo Xu, Yuanxin Zhong, Pan Guo, Qunliang Song
Summary: By introducing a LiF anode buffer layer in inverted PSCs to modify the PEDOT:PSS HTL, the charge extraction ability was improved, leading to a significant enhancement in the power conversion efficiency of the solar cells. This work provides a simple and effective method to increase the electrical performance of inverted PSCs.
ORGANIC ELECTRONICS
(2022)
Article
Optics
Pawel Popielarski, Lidia Mosinska, Tetiana Zorenko, Yuriy Zorenko
Summary: This work investigates the luminescent properties of Tris (8-hydroxyquinoline) aluminium (Alq3) thin layers using conventional spectral methods and advanced time-resolved luminescent spectroscopy. Alq3 films with a thickness of 100-300 nm were deposited on silicon substrates using PVD method. The structural properties of Alq3 layers were studied using scanning electronic microscopy and X-ray diffraction. The luminescence spectra of Alq3 in the green-yellow range confirm the complex structure of the emission centers associated with the Al3+ molecule and 8-hydroxyquinoline ligands.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Erica Magliano, Paolo Mariani, Antonio Agresti, Sara Pescetelli, Fabio Matteocci, Babak Taheri, Antonio Cricenti, Marco Luce, Aldo Di Carlo
Summary: This study developed an indium tin oxide (ITO) deposition process that effectively suppresses sputtering damage by using a transition metal oxides (TMOs)-based buffer layer. The research found that an ultrathin layer of evaporated vanadium oxide or molybdenum oxide can protect against sputtering damage in ST-PSCs for tandem applications and thin perovskite-based devices for building-integrated photovoltaics.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yong Ryun Kim, Chang Mok Oh, Chang Jae Yoon, Ju-Hyeon Kim, Kiyoung Park, Kwanghee Lee, In-Wook Hwang, Heejoo Kim
Summary: By engineering additives onto the electron transport layer (ETL), highly stable and efficient cathode-buffer-layer-free inverted perovskite solar cells (I-PeSCs) have been achieved, showing simplified fabrication process, improved efficiency, good stability, and passivation of trap density, leading to enhanced device performance.
Article
Chemistry, Multidisciplinary
Benfang Niu, Haoran Liu, Yanchun Huang, Emely Gu, Minxing Yan, Ziqiu Shen, Kangrong Yan, Buyi Yan, Jizhong Yao, Yanjun Fang, Hongzheng Chen, Chang-Zhi Li
Summary: A simple and scalable interfacial strategy is reported to facilitate the assembly of high-performance inverted perovskite solar cells (PSCs) and scale-up modules. This strategy improves the chemical stability, charge extraction, and energy level alignment of the hole-selective interface, while promoting perovskite crystallization. As a result, the corresponding inverted PSCs and modules achieve remarkable power conversion efficiencies (PCEs) of 24.5% and 20.7% (aperture area of 19.4 cm(2)), respectively. This strategy is also effective for perovskite with various bandgaps, demonstrating the highest PCE of 19.6% for the 1.76-eV bandgap PSCs.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Junhua You, Ziyu Liu
Summary: The study used DFT-MD simulation to investigate the protective effect of 8HQ as a green inhibitor for Al2Cu alloy, revealing that 8HQ can significantly reduce the oxidation rate and inhibit oxidation when coverage reaches 86%, showing promise as a novel green inhibitor for corrosion protection.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Yufan Liu, Bin Li, Xiaoyang Liang, Tao Liu, Shufang Wang, Zhiqiang Li
Summary: This study improves the performance of Sb2Se3 solar cells by preparing CdS:O buffer layers and using CBD-CdS to repair interface damage. Optimizing the composition and phase of the composite buffer allows for the achievement of wide band-gap buffer layers and improvement in device spectra response and JSC, VOC parameters.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Sikandar Iqbal, Aadil Nabi Chishti, Muhammad Bilal Hussain, Fakhr uz Zaman, Abdul Qayum, Rashid Mehmood, Shahid Zaman
Summary: The conductivity and intrinsic properties of PEDOT:PSS have been improved by doping with ammonium chloride (NH4Cl), making it a potential candidate for high-efficiency inverted perovskite solar cells. The doped PEDOT:PSS exhibits higher conductivity and surface roughness, leading to increased light absorption and improved power conversion efficiency.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoya Hou, Kun Zhang, Dahua Chen, Yulei Zhang, Jie Zhang
Summary: The versatile nonfullerene perylene diimide-based electron acceptor showed good device performance in inverted organic solar cells and organic photodetectors. The ZnO films were modified with different materials to enhance electron transportation. The efficiency of the inverted device using ZnO/EG as the electron transporting layer was improved to 3.61%, with a higher Jsc of 10.06 mA/cm2. The interfacial modification also reduced the dark current of the organic photodetector and improved its external quantum efficiency.
Article
Chemistry, Multidisciplinary
Juho Antti Sirvio, Juha P. Heiskanen
Article
Biochemistry & Molecular Biology
Tuomo P. Kainulainen, Terttu Hukka, Husamettin D. Ozeren, Juho A. Sirvio, Mikael S. Hedenqvist, Juha P. Heiskanen
Article
Materials Science, Paper & Wood
Juho Antti Sirvio, Juha P. Heiskanen
Article
Chemistry, Multidisciplinary
Mirko M. Maksimainen, Antti Nurmesjarvi, Reima A. Terho, Michael D. Threadgill, Lari Lehtio, Juha P. Heiskanen
Article
Engineering, Chemical
Asmaa M. Ahmed, Tuomo P. Kainulainen, Juha P. Heiskanen
Summary: Copolyesters modified with BFDCA showed improved properties such as higher biocarbon content, higher tensile moduli, enhanced oxygen gas barrier properties, superior UV blocking, while maintaining good transparency, making them promising materials for advanced packaging applications.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Biochemistry & Molecular Biology
Mirko M. Maksimainen, Sudarshan Murthy, Sven T. Sowa, Albert Galera-Prat, Elena Rolina, Juha P. Heiskanen, Lari Lehtio
Summary: By modifying the structure of inhibitor molecules, the selectivity was successfully shifted from poly-ADP-ribosyltransferases to mono-ADP-ribosyltransferases, and the binding modes of analogs were experimentally verified. The study demonstrates a method to differentiate compound selectivity between mono- and poly-ribosyltransferases in the human ARTD family.
BIOORGANIC & MEDICINAL CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Asmaa M. Ahmed, Tuomo P. Kainulainen, Juho Antti Sirvio, Juha P. Heiskanen
Summary: Efforts have been made to achieve high barriers with bio-based materials by synthesizing a series of novel polyesters with high oxygen barrier properties. These polyesters exhibit good thermal stability and tensile properties, as well as a slight UV shielding effect.
Article
Polymer Science
Tuomo P. Kainulainen, Vasantha Gowda, Juha P. Heiskanen, Mikael S. Hedenqvist
Summary: The degradation behavior of furan-based polymers was investigated under artificial weathering conditions. The results showed that these polymers are relatively unstable under UV light and undergo covalent cross-linking reactions. The nature of the cross-linking mechanisms and the exact structure of the formed degradation products remain unclear. The study also found that aging-induced crystallization plays an important role in the final properties, especially in easily crystallizable samples.
POLYMER DEGRADATION AND STABILITY
(2022)
Article
Polymer Science
Tuomo P. Kainulainen, Tomi A. O. Parviainen, Juho Antti Sirvio, Liam J. R. McGeachie, Juha P. Heiskanen
Summary: An exceptional oxygen barrier polyester was prepared from 3,3'-bifuran-5,5'-dicarboxylic acid, a new biomass-derived monomer. The cross-linking of the furan-based polyester upon exposure to air significantly reduced its O2 permeability, rendering its performance comparable to ethylene-vinyl alcohol copolymers. The structural trigger for this transformation was the presence of 5,5'-disubstituted 3,3'-bifuran moieties.
Article
Materials Science, Multidisciplinary
Asmaa M. Ahmed, Tuomo P. Kainulainen, Juho Antti Sirvio, Juha P. Heiskanen
Summary: A series of furan-based copolyesters were synthesized and investigated for their glass transition temperature (Tg) matching with poly(ethylene terephthalate) (PET) as well as their enhanced O2 barrier properties. The copolyesters, composed of dimethyl 5,5'-sulfanediyldi(furan-2-carboxylate) (DM-SFA) with either dimethyl 2,5-furandicarboxylate (DM-FDCA) or dimethyl 2,2'-bifuran-5,5'-dicarboxylate (DM-BFDCA) as the main monomers, showed Tg similar to PET and low O2 and UV-light permeabilities. The addition of DM-FDCA as a minor comonomer provided PET-like Tg, whereas the O2 permeabilities were reduced compared to DM-BFDCA-based copolyesters. Furthermore, the copolyesters containing isosorbide (IS) as a comonomer showed lower thermal stability and incomplete dissolution after polycondensation.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Applied
Juho Antti Sirvio, Marja Mikola, Juha Ahola, Juha P. Heiskanen, Svitlana Filonenko, Ari Ammala
Summary: The efficient fractionation and production of biomass components are crucial in the biorefinery concept. The recalcitrant nature of lignocellulose biomass, especially softwood, poses a significant obstacle to the wider application of biomass-based chemicals and materials. This study investigated the use of aqueous acidic systems with thiourea for the fractionation of softwood under mild conditions. High lignin removal efficiency (approximately 90%) was achieved despite low temperature and treatment times. The fractionation process involved nucleophilic addition of thiourea to lignin, resulting in its dissolution in acidic water. The obtained fiber and lignin fractions also exhibited bright colors and improved usability in material applications.
CARBOHYDRATE POLYMERS
(2023)
Article
Polymer Science
Tuomo P. Kainulainen, Asmaa M. Ahmed, Juho Antti Sirvio, Juha P. Heiskanen
Summary: In this study, oxidation of 5,5'-sulfanediyldi(furan-2-carboxylic acid) in acetic acid with aqueous hydrogen peroxide was used to prepare a new dicarboxylic monomer with a central sulfone group flanked by two biomass-derived furan rings. The new sulfone monomer was then reacted with various diols to prepare homopolyesters and copolyesters. The resulting polyester materials exhibited high glass transition temperatures, high tensile stiffnesses, and low O2 permeability. Notably, 1,5-pentanediol yielded the polyester with the most favorable properties. The stability of the monomer, particularly its side reactions under high temperatures, remained unclear.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Polymer Science
Asmaa M. Ahmed, Tuomo P. Kainulainen, Juho Antti Sirvio, Juha P. Heiskanen
Summary: A novel biobased sulfur-bridged polyester with high oxygen barrier properties was synthesized using a new furfural-based monomer, methyl 5-[(2-hydroxyethyl)sulfanyl]furan-2-carboxylate (MSF), through self-condensation. The resulting polyester showed significant improvements in oxygen barrier and UV light filtering capabilities due to the introduction of sulfur heteroatom. The monomer, MSF, was also utilized to enhance the barrier performance of poly(ethylene furanoate) (PEF) and poly(ethylene bifuranoate) (PEBF) copolymers, indicating its potential for sustainable biobased packaging materials.
Article
Chemistry, Physical
Alexander Alekseev, Alexander Efimov, Vladimir Chukharev, Artem Ivanov, Helge Lemmetyinen
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
Article
Materials Science, Multidisciplinary
Tuomo P. Kainulainen, Pyry Erkkil, Terttu Hukka, Juho A. Sirvio, Juha P. Heiskanen
ACS APPLIED POLYMER MATERIALS
(2020)